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range.go
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range.go
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package nu
import (
"fmt"
"github.com/vmihailenco/msgpack/v5"
"github.com/vmihailenco/msgpack/v5/msgpcode"
)
type RangeBound uint8
const (
Unbounded RangeBound = 0
Included RangeBound = 1
Excluded RangeBound = 2
)
/*
IntRange is IntRange variant of [Nushell Range] type.
[Nushell Range]: https://www.nushell.sh/contributor-book/plugin_protocol_reference.html#range
*/
type IntRange struct {
Start int64
Step int64
End int64
Bound RangeBound // end bound kind of the range
}
var _ msgpack.CustomEncoder = (*IntRange)(nil)
func (v *IntRange) EncodeMsgpack(enc *msgpack.Encoder) error {
if err := encodeMapStart(enc, "IntRange"); err != nil {
return err
}
if err := enc.EncodeMapLen(3); err != nil {
return err
}
if err := enc.EncodeString("start"); err != nil {
return err
}
if err := enc.EncodeInt(v.Start); err != nil {
return err
}
if err := enc.EncodeString("step"); err != nil {
return err
}
if err := enc.EncodeInt(v.Step); err != nil {
return err
}
if err := enc.EncodeString("end"); err != nil {
return err
}
if err := v.encodeEndBound(enc); err != nil {
return err
}
return nil
}
func (v *IntRange) encodeEndBound(enc *msgpack.Encoder) (err error) {
if v.Bound == Unbounded {
return enc.EncodeString("Unbounded")
}
if err := enc.EncodeMapLen(1); err != nil {
return err
}
switch v.Bound {
case Included:
err = enc.EncodeString("Included")
case Excluded:
err = enc.EncodeString("Excluded")
default:
return fmt.Errorf("unsupported bound value: %d", v.Bound)
}
if err != nil {
return err
}
return enc.EncodeInt(v.End)
}
func (v *IntRange) decodeEndBound(dec *msgpack.Decoder) (err error) {
code, err := dec.PeekCode()
if err != nil {
return fmt.Errorf("peek the type of the end bound of IntRange: %w", err)
}
var name string
switch {
case msgpcode.IsFixedMap(code) || code == msgpcode.Map16 || code == msgpcode.Map32:
if n, err := dec.DecodeMapLen(); err != nil || n != 1 {
return fmt.Errorf("expected single item map as end bound, got [%d] or error: %w", n, err)
}
name, err = dec.DecodeString()
case msgpcode.IsString(code):
name, err = dec.DecodeString()
}
if err != nil {
return err
}
switch name {
case "Unbounded":
v.Bound = Unbounded
return nil
case "Included":
v.Bound = Included
case "Excluded":
v.Bound = Excluded
default:
return fmt.Errorf("unsupported bound name %q", name)
}
v.End, err = dec.DecodeInt64()
return err
}
var _ msgpack.CustomDecoder = (*IntRange)(nil)
func (v *IntRange) DecodeMsgpack(dec *msgpack.Decoder) error {
n, err := dec.DecodeMapLen()
if err != nil {
return err
}
if n == -1 {
return nil
}
for idx := 0; idx < n; idx++ {
fieldName, err := dec.DecodeString()
if err != nil {
return fmt.Errorf("decoding field name [%d/%d] of IntRange: %w", idx+1, n, err)
}
switch fieldName {
case "start":
v.Start, err = dec.DecodeInt64()
case "step":
v.Step, err = dec.DecodeInt64()
case "end":
err = v.decodeEndBound(dec)
default:
return fmt.Errorf("unexpected key %q in IntRange", fieldName)
}
if err != nil {
return fmt.Errorf("decode field %q: %w", fieldName, err)
}
}
return nil
}
func decodeMsgpackRange(dec *msgpack.Decoder) (any, error) {
name, err := decodeWrapperMap(dec)
if err != nil {
return nil, fmt.Errorf("decoding Range value kind: %w", err)
}
switch name {
case "IntRange":
v := IntRange{}
return v, v.DecodeMsgpack(dec)
case "FloatRange":
return nil, fmt.Errorf("FloatRange is not implemented")
default:
return nil, fmt.Errorf("unsupported Range type: %q", name)
}
}